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Airborne EM, magnetic, and radiometric survey data Airborne electromagnetic (AEM), magnetic, and radiometric data were acquired in late February to early March 2018 along 2,364 line-kilometers in the Shellmound, Mississippi study area. Data were acquired by CGG Canada Services, Ltd. with three different helicopter-borne sensors: the CGG Canada Services, Ltd. RESOLVE frequency-domain AEM instrument that is used to map subsurface geologic structure at depths up to 100 meters, depending on the subsurface resistivity; a Scintrex CS-3 cesium vapor magnetometer that detects changes in deep (hundreds of meters to kilometers) geologic structure based on variations in the magnetic properties of different formations; and a Radiation Solutions RS-500 spectrometer that detects... Categories: Data; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, Greenwood, Leflore County, MRVA, All tags... Mississippi, Mississippi Alluvial Plain, Mississippi River Valley Alluvial aquifer, Shellmound, Sunflower County, Tallahatchie River, aeromagnetic surveying, aeroradiometric surveying, electromagnetic surveying, electromagnetics, engineering sciences, environment, geophysics, geoscientificInformation, geospatial datasets, groundwater, hydrogeology, magnetic anomaly maps, magnetic field, magnetics, radiometrics, resistivity, water resources, Fewer tags AEM inverted resistivity models Airborne electromagnetic (AEM), magnetic, and radiometric data were acquired November 2018 to February 2019 along 16,816 line-kilometers (line-km) over the Mississippi Alluvial Plain (MAP). Data were acquired by CGG Canada Services, Ltd. with three different helicopter-borne sensors: the CGG Canada Services, Ltd. Resolve frequency-domain AEM instrument that is used to map subsurface geologic structure at depths up to 100 meters, depending on the subsurface resistivity; a Scintrex CS-3 cesium vapor magnetometer that detects changes in deep (hundreds of meters to kilometers) geologic structure based on variations in the magnetic properties of different formations; and a Radiation Solutions RS-500 spectrometer that... Categories: Data; Tags: Arkansas, Bayou Bartholomew, Bayou Meto, Boeuf River, Cache River, All tags... Coldwater River, Crowley's Ridge, GGGSC, Geology, Geophysics, and Geochemistry Science Center, Illinois, L'Anguille River, Louisiana, MRVA, Mississippi, Mississippi Alluvial Plain, Mississippi River, Mississippi River Valley Alluvial aquifer, Missouri, Saint Francis River, Tallahatchie River, Tennessee, WAUSP, Water Availability and Use Science Program, Yazoo River, aeromagnetic surveying, aeroradiometric surveying, electromagnetic surveying, electromagnetics, engineering sciences, environment, geophysics, geoscientificInformation, geospatial datasets, groundwater, hydrogeology, magnetic field, magnetics, radiometrics, resistivity, water resources, Fewer tags Processed ground-based EM survey data Shallow soil characteristics were mapped near Shellmound, Mississippi, using the DualEM 421 electromagnetic sensor in October 2018. Data were acquired by towing the DualEM sensor on a wheeled cart behind an ATV, with the sensor at a height of 0.432 meters (m) above the ground surface. Approximately 175 line-kilometers of data were acquired over an area of nearly four square kilometers, with 25 m separation between survey lines. Data were manually edited for noise sources such as powerlines or other buried structures, and averaged to regular output soundings every 5 m along survey lines. This data release contains the processed data that have been averaged and culled to produce final resistivity models. Digital data... Categories: Data; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, Leflore County, MRVA, Mississippi, All tags... Mississippi Alluvial Plain, Mississippi River Valley Alluvial aquifer, Shellmound, Tallahatchie River, electromagnetic surveying, electromagnetics, engineering sciences, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, water resources, Fewer tags Stateline NWR, Montana, 2017 Shallow subsurface electrical conductivity was mapped at Stateline National Wildlife Refuge (NWR) in northeast Montana using the DUALEM421 electromagnetic sensor (Dualem, Inc., ON, Canada) in the winter of 2017. Data were acquired by towing the DUALEM421 sensor on a sled behind an all-terrain vehicle or snow machine, with the sensor at a nominal height of 0.3 meters (m) above ground surface. Approximately 3 line-kilometers (km) of data were acquired over an area of approximately .2 square-kilometers. Data were manually edited to remove sensor dropouts, lag corrected for apparent offsets between recorded GPS location and data locations for each coil pair, and averaged to a sounding distance of 1m along the survey... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, Montana, NOROCK, National Wildlife Refuge, All tags... Northern Rocky Mountain Science Center, Prairie Pothole Region, STEPPE, Science Team about Energy and Plains and Potholes Environments, Stateline, Williston Basin, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, salinity, water resources, Fewer tags Beaver Lake NWR, North Dakota, 2018 Shallow subsurface electrical conductivity was mapped at Beaver Lake National Wildlife Refuge (NWR) in northwest North Dakota using the DUALEM421 electromagnetic sensor (Dualem, Inc., ON, Canada) in the winter of 2018. Data were acquired by towing the DUALEM421 sensor on a sled behind an all-terrain vehicle or snow machine, with the sensor at a nominal height of 0.3 meters (m) above ground surface. Approximately 127 line-kilometers (km) of data were acquired over an area of approximately 8 square-kilometers. At this survey location, the 4m transmitter-receiver horizontal co-planar and perpendicular coil orientations did not function due to equipment malfunction. Data were manually edited to remove sensor dropouts,... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Beaver Lake, GGGSC, Geology, Geophysics, and Geochemistry Science Center, NOROCK, National Wildlife Refuge, All tags... North Dakota, Northern Rocky Mountain Science Center, Prairie Pothole Region, STEPPE, Science Team about Energy and Plains and Potholes Environments, Williston Basin, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, salinity, water resources, Fewer tags North Root NWR, Montana, 2017 Shallow subsurface electrical conductivity was mapped at North Root National Wildlife Refuge (NWR) in northeast Montana using the DUALEM421 electromagnetic sensor (Dualem, Inc., ON, Canada) in the winter of 2017. Data were acquired by towing the DUALEM421 sensor on a sled behind an all-terrain vehicle or snow machine, with the sensor at a nominal height of 0.3 meters (m) above ground surface. Approximately 9 line-kilometers (km) of data were acquired over an area of approximately 1 square-kilometer. Data were manually edited to remove sensor dropouts, lag corrected for apparent offsets between recorded GPS location and data locations for each coil pair, and averaged to a sounding distance of 1m along the survey... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, Montana, NOROCK, National Wildlife Refuge, All tags... North Root, Northern Rocky Mountain Science Center, Prairie Pothole Region, STEPPE, Science Team about Energy and Plains and Potholes Environments, Williston Basin, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, salinity, water resources, Fewer tags Gjesdal East NWR, Montana, 2017 Shallow subsurface electrical conductivity was mapped at Gjesdal East National Wildlife Refuge (NWR) in northeast Montana using the DUALEM421 electromagnetic sensor (Dualem, Inc., ON, Canada) in the winter of 2017. Data were acquired by towing the DUALEM421 sensor on a sled behind an all-terrain vehicle or snow machine, with the sensor at a nominal height of 0.3 meters (m) above ground surface. Approximately 13 line-kilometers (km) of data were acquired over an area of approximately .7 square-kilometers. Data were manually edited to remove sensor dropouts, lag corrected for apparent offsets between recorded GPS location and data locations for each coil pair, and averaged to a sounding distance of 1m along the survey... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, Gjesdal East, Montana, NOROCK, All tags... National Wildlife Refuge, Northern Rocky Mountain Science Center, Prairie Pothole Region, STEPPE, Science Team about Energy and Plains and Potholes Environments, Sheridan County, MT, Williston Basin, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, salinity, water resources, Fewer tags Hansen NWR, Montana, 2017 Shallow subsurface electrical conductivity was mapped at Hansen National Wildlife Refuge (NWR) in northeast Montana using the DUALEM421 electromagnetic sensor (Dualem, Inc., ON, Canada) in the winter of 2017. Data were acquired by towing the DUALEM421 sensor on a sled behind an all-terrain vehicle or snow machine, with the sensor at a nominal height of 0.3 meters (m) above ground surface. Approximately 10 line-kilometers (km) of data were acquired over an area of approximately .2 square-kilometers. Data were manually edited to remove sensor dropouts, lag corrected for apparent offsets between recorded GPS location and data locations for each coil pair, and averaged to a sounding distance of 1m along the survey path;... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, Hansen, Montana, NOROCK, All tags... National Wildlife Refuge, Northern Rocky Mountain Science Center, Prairie Pothole Region, STEPPE, Science Team about Energy and Plains and Potholes Environments, Sheridan County, Williston Basin, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, salinity, water resources, Fewer tags Unprocessed ground-based EM survey data Shallow soil characteristics were mapped near Shellmound, Mississippi, using the DualEM 421 electromagnetic sensor in October 2018. Data were acquired by towing the DualEM sensor on a wheeled cart behind an ATV, with the sensor at a height of 0.432 meters (m) above the ground surface. Approximately 175 line-kilometers of data were acquired over an area of nearly four square kilometers, with 25 m separation between survey lines. Raw data are provided here. Categories: Data; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, Leflore County, MRVA, Mississippi, All tags... Mississippi Alluvial Plain, Mississippi River Valley Alluvial aquifer, Shellmound, Tallahatchie River, electromagnetic surveying, electromagnetics, engineering sciences, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, water resources, Fewer tags Airborne electromagnetic, magnetic, and radiometric survey of the Mississippi Alluvial Plain, November 2019 - March 2020 Airborne electromagnetic (AEM), magnetic, and radiometric data were acquired November 2019 to March 2020 along 24,030 line-kilometers (line-km) over the Mississippi Alluvial Plain (MAP). Data were acquired by CGG Canada Services, Ltd. with three different airborne sensors: the CGG Canada Services, Ltd. TEMPEST time-domain AEM instrument that is used to map subsurface geologic structure at depths up to 300 meters (m), depending on the subsurface resistivity; a Scintrex CS-3 cesium vapor magnetometer that detects changes in deep (hundreds of meters to kilometers) geologic structure based on variations in the magnetic properties of different formations; and a Radiation Solutions RS-500 spectrometer that detects the... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Arkansas, Arkansas River, GGGSC, Geology, Geophysics, and Geochemistry Science Center, Geophysics, All tags... Hydrology, Illinois, Louisiana, MRVA, Mississippi, Mississippi Alluvial Plain, Mississippi River, Mississippi River Valley Alluvial aquifer, Missouri, New Madrid Seismic Zone, Shellmound, Tennessee, U.S. Geological Survey, USGS, USGS Science Data Catalog (SDC), WAUSP, Water Availability and Use Science Program, Water Resources, aeromagnetic surveying, aeroradiometric surveying, electromagnetic surveying, electromagnetics, engineering sciences, environment, geologic structure, geophysics, geoscientificInformation, geospatial datasets, groundwater, hydrogeology, hydrology, magnetic field, magnetics, potassium, radiometrics, resistivity, thorium, uranium, water resources, Fewer tags Ground-based electromagnetic survey, Alamosa, Colorado, March 2020 Shallow soil conductivity was mapped in the San Luis Valley, Colorado, using the DualEM421 electromagnetic sensor in March 2020. Data were acquired by towing the DualEM421 sensor on a wheeled cart behind an all-terrain vehicle, with the sensor at a height of 0.457 m above the ground surface. Approximately 62 line-kilometers of data were acquired over an area of nearly 1.5 square kilometers, with 20 m separation between survey lines. Data were manually edited for noise sources (powerlines, pipelines, or other buried structures), and averaged to regular output soundings every 1 m along survey lines. Data were corrected for offset between the recorded GPS location and data locations for each coil pair, but were not... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Alamosa County, Colorado, GGGSC, Geology, Geophysics, and Geochemistry Science Center, Mineral Resources, All tags... San Luis Valley, USGS Science Data Catalog (SDC), Water Resources, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, water resources, Fewer tags Ground conductivity measurements at selected National Wildlife Refuges, Montana and North Dakota, 2017-2018 Shallow subsurface electrical conductivity was mapped at selected U.S. Fish and Wildlife Service managed lands in northeast Montana and northwest North Dakota using the DUALEM421 electromagnetic sensor (Dualem, Inc., ON, Canada) in the winters of 2017 and 2018. Data were acquired by towing the DUALEM421 sensor on a sled behind an all-terrain vehicle or snow machine, with the sensor at a nominal height of 0.3 meters (m) above ground surface. Approximately 427 line-kilometers (km) of data were acquired over an area of nearly 26 square-kilometers. Data were manually edited to remove sensor dropouts, lag corrected for apparent offsets between recorded GPS location and data locations for each coil pair, and averaged... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Anderson, Beaver Lake, Bigslough, Divide County, ND, Dog Leg, All tags... GGGSC, Geology, Geophysics, and Geochemistry Science Center, Gjesdal East, Goose Lake, Hansen, Jerde, Larson Slough, Lindell, Medicine Lake, Medwell, Montana, NOROCK, National Wildlife Refuge, Norman Lake, North Dakota, North Root, Northeast, Northern Rocky Mountain Science Center, Prairie Pothole Region, Rabenberg, STEPPE, Science Team about Energy and Plains and Potholes Environments, Sheridan County, MT, Stateline, USGS Science Data Catalog (SDC), Ward, Westby, MT, Westgard, Wigeon, Williston Basin, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, https://www.sciencebase.gov/catalog/item/5e739c2de4b01d50926c0a08, hydrogeology, resistivity, salinity, water resources, Fewer tags Ward NWR, Montana, 2017 Shallow subsurface electrical conductivity was mapped at Ward National Wildlife Refuge (NWR) in northeast Montana using the DUALEM421 electromagnetic sensor (Dualem, Inc., ON, Canada) in the winter of 2017. Data were acquired by towing the DUALEM421 sensor on a sled behind an all-terrain vehicle or snow machine, with the sensor at a nominal height of 0.3 meters (m) above ground surface. Approximately 15 line-kilometers (km) of data were acquired over an area of approximately .5 square-kilometers. Data were manually edited to remove sensor dropouts, lag corrected for apparent offsets between recorded GPS location and data locations for each coil pair, and averaged to a sounding distance of 1m along the survey path;... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, Montana, NOROCK, National Wildlife Refuge, All tags... Northern Rocky Mountain Science Center, Prairie Pothole Region, STEPPE, Science Team about Energy and Plains and Potholes Environments, Ward, Williston Basin, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, salinity, water resources, Fewer tags Electrical resistivity tomography (ERT) data Surface electrical resistivity tomography (ERT), electromagnetic induction (EMI), and self-potential (SP) data were acquired March 9 - 20, 2018 by the U.S. Geological Survey, in collaboration with the U.S. Army Corps of Engineers, at the Jim Woodruff Lock and Dam near Chattahoochee, Florida. Eleven ERT profiles were acquired along the right (west) abutment, and immediately downstream, of the concrete, fixed-crest spillway located west of the lock to map geologic structure at depths up to 50 meters (m) using the Advanced Geosciences, Inc. SuperSting R8 resistivity meter. This data release includes the raw and processed resistivity data as well as inverted resistivity models. All are provided as digital data, and... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Apalachicola River, Chattahoochee, Chattahoochee River, Decatur County, ERT surveying, All tags... Flint River, Florida, GGGSC, Gadsden County, Geology, Geophysics, and Geochemistry Science Center, Georgia, Jackson County, Jim Woodruff Lock and Dam, Lake Seminole, Polk Lake, Suwannee Limestone, Tampa Limestone, U.S. Geological Survey, USGS, Upper Floridan Aquifer, dam, electrical resistivity imaging, electrical resistivity tomography, electromagnetic induction, electromagnetic surveying, electromagnetics, engineering sciences, environment, geophysics, geoscientificInformation, geospatial datasets, groundwater, hydrogeology, karst, resistivity, self-potential, sinkhole formation, spontaneous-potential, surface water (non-marine), water resources, Fewer tags Magnetics Data Surface electrical resistivity tomography, magnetic, and gravity surveys were conducted in July 2017 in the greater East River Watershed near Crested Butte Colorado with a focused effort in Redwell Basin as part of a broader study of the role of bedrock groundwater in the hydrogeology of mineralized mountain watersheds. Approximately ten kilometers of total field magnetics data were acquired on July 29, 2017 with a Geometrics G-858 cesium vapor magnetometer that detects changes in deep (tens of meters to kilometers) geologic structure based on variations in the magnetic properties of different formations. This data release includes the raw and processed magnetics data. They are provided as digital data, and data... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Brush Creek, Colorado, Crested Butte, East River, GGGSC, All tags... Geology, Geophysics, and Geochemistry Science Center, Gothic, Gunnison County, MRP, Mineral Resources Program, Mount Emmons, Oh-be-joyful, Redwell Basin, U.S. Geological Survey, USGS, bouguer anomaly, electrical resistivity tomography, electromagnetic surveying, electromagnetics, environment, free-air anomaly, geophysics, geoscientificInformation, geospatial datasets, gravimeter measurement, gravitational field (earth), gravity, groundwater, hydrogeology, magnetic anomaly maps, magnetic field, magnetic surveying, magnetics, nuclear magnetic resonance, resistivity, water resources, Fewer tags AEM inverted resistivity models Airborne electromagnetic (AEM), magnetic, and radiometric data were acquired in late February to early March 2018 along 2,364 line-kilometers in the Shellmound, Mississippi study area. Data were acquired by CGG Canada Services, Ltd. with three different helicopter-borne sensors: the CGG Canada Services, Ltd. RESOLVE frequency-domain AEM instrument that is used to map subsurface geologic structure at depths up to 100 meters, depending on the subsurface resistivity; a Scintrex CS-3 cesium vapor magnetometer that detects changes in deep (hundreds of meters to kilometers) geologic structure based on variations in the magnetic properties of different formations; and a Radiation Solutions RS-500 spectrometer that detects... Categories: Data; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, Greenwood, Leflore County, MRVA, All tags... Mississippi, Mississippi Alluvial Plain, Mississippi River Valley Alluvial aquifer, Shellmound, Sunflower County, Tallahatchie River, aeromagnetic surveying, aeroradiometric surveying, electromagnetic surveying, electromagnetics, engineering sciences, environment, geophysics, geoscientificInformation, geospatial datasets, groundwater, hydrogeology, magnetic anomaly maps, magnetic field, magnetics, radiometrics, resistivity, water resources, Fewer tags Floating and Towed Transient Electromagnetic Surveys used to Characterize Hydrogeology underlying Rivers and Estuaries: March - December 2018 Surface and water-borne geophysical methods can provide information for the characterization of the subsurface structure of the earth for aquifer investigations. Floating and towed transient electromagnetic (FloaTEM and tTEM) surveys provide resistivity soundings of the subsurface, which can be related to lithology and hydrogeology. In the TEM method, a primary electrical current is cycled through a wire in a transmitter loop (Tx), which in turn produces a static primary magnetic field. When the current in the TX loop is abruptly terminated, secondary electrical currents are induced in the earth that move downward and outward decaying with time. The decay of the secondary electrical field is controlled by the subsurface... Categories: Data; Tags: Geophysics, Greenwood, Hydrology, Leflore County, MRVA, All tags... Mississippi, Mississippi Alluvial Plain, Mississippi River Valley Alluvial aquifer, Shellmound, Tallahatchie River, USGS Science Data Catalog (SDC), Water Resources, electromagnetic surveying, electromagnetics, geophysics, geoscientificInformation, geospatial datasets, groundwater, hydrogeology, oceans, resistivity, transient electromagnetics, water resources, water-borne, Fewer tags Goose Lake NWR, Montana, 2017 Shallow subsurface electrical conductivity was mapped at Goose Lake National Wildlife Refuge (NWR) in northeast Montana using the DUALEM421 electromagnetic sensor (Dualem, Inc., ON, Canada) in the winter of 2017. Data were acquired by towing the DUALEM421 sensor on a sled behind an all-terrain vehicle or snow machine, with the sensor at a nominal height of 0.3 meters (m) above ground surface. Approximately 15 line-kilometers (km) of data were acquired over an area of approximately 1 square-kilometer. Data were manually edited to remove sensor dropouts, lag corrected for apparent offsets between recorded GPS location and data locations for each coil pair, and averaged to a sounding distance of 1m along the survey... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, Goose Lake, Montana, NOROCK, All tags... National Wildlife Refuge, Northern Rocky Mountain Science Center, Prairie Pothole Region, STEPPE, Science Team about Energy and Plains and Potholes Environments, Williston Basin, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, salinity, water resources, Fewer tags Self-potential (SP) data Surface electrical resistivity tomography (ERT), electromagnetic induction (EMI), and self-potential (SP) data were acquired March 9 - 20, 2018 by the U.S. Geological Survey, in collaboration with the U.S. Army Corps of Engineers, at the Jim Woodruff Lock and Dam near Chattahoochee, Florida. Self-potential (SP) data were acquired at 384 unique stations with Borin Stelth 3 copper-copper sulfate porous-pot electrodes and Keysight U1253B high-impedance multimeter to identify variations in subsurface hydrologic flow. This data release includes the raw and processed self-potential data. They are provided as digital data, and data fields are defined in the data dictionary. Jim Woodruff Lock and Dam is located... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Apalachicola River, Chattahoochee, Chattahoochee River, Decatur County, ERT surveying, All tags... Flint River, Florida, GGGSC, Gadsden County, Geology, Geophysics, and Geochemistry Science Center, Georgia, Jackson County, Jim Woodruff Lock and Dam, Lake Seminole, Polk Lake, Suwannee Limestone, Tampa Limestone, U.S. Geological Survey, USGS, Upper Floridan Aquifer, dam, electrical resistivity imaging, electrical resistivity tomography, electromagnetic induction, electromagnetic surveying, electromagnetics, engineering sciences, environment, geophysics, geoscientificInformation, geospatial datasets, groundwater, hydrogeology, karst, resistivity, self-potential, sinkhole formation, spontaneous-potential, surface water (non-marine), water resources, Fewer tags Norman Lake NWR, North Dakota, 2018 Shallow subsurface electrical conductivity was mapped at Norman Lake National Wildlife Refuge (NWR) in northwest North Dakota using the DUALEM421 electromagnetic sensor (Dualem, Inc., ON, Canada) in the winter of 2018. Data were acquired by towing the DUALEM421 sensor on a sled behind an all-terrain vehicle or snow machine, with the sensor at a nominal height of 0.3 meters (m) above ground surface. Approximately 41 line-kilometers (km) of data were acquired over an area of approximately 2 square-kilometers. At this survey location, the 4m transmitter-receiver horizontal co-panar and perpendicular coil orientations did not function due to equipment malfunction. Data were manually edited to remove sensor dropouts,... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, NOROCK, National Wildlife Refuge, Norman Lake, All tags... North Dakota, Northern Rocky Mountain Science Center, Prairie Pothole Region, STEPPE, Science Team about Energy and Plains and Potholes Environments, Williston Basin, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, salinity, water resources, Fewer tags 1 2 3 »